ICD-10 Code for Mononeuritis
The ICD-10-CM code for mononeuritis is G58.9 — Mononeuropathy, unspecified. This is the code the Alphabetic Index gives for mononeuritis with no further qualifier, valid for FY2027 (October 1, 2026 – September 30, 2027).
G58.9 is billable but unspecified. If the documentation names a type, site or cause, one of the more specific codes below is likely expected.
Which mononeuritis code should you use?
The Alphabetic Index lists 17 codes under Mononeuritis. Which one applies depends on the qualifier documented in the record — the type, site, cause, or associated condition. Find the qualifier below, then verify the code in the Tabular List before using it.
By type
| femoral nerve | G57.2 | Lesion of femoral nerve | not billable |
| lower limb | G57.9 | Unspecified mononeuropathy of lower limb | not billable |
| medial popliteal nerve | G57.4 | Lesion of medial popliteal nerve | not billable |
| median nerve | G56.1 | Other lesions of median nerve | not billable |
| multiplex | G58.7 | Mononeuritis multiplex | |
| plantar nerve | G57.6 | Lesion of plantar nerve | not billable |
| posterior tibial nerve | G57.5 | Tarsal tunnel syndrome | not billable |
| radial nerve | G56.3 | Lesion of radial nerve | not billable |
| sciatic nerve | G57.0 | Lesion of sciatic nerve | not billable |
| specified NEC | G58.8 | Other specified mononeuropathies | |
| tibial nerve | G57.4 | Lesion of medial popliteal nerve | not billable |
| ulnar nerve | G56.2 | Lesion of ulnar nerve | not billable |
| upper limb | G56.9 | Unspecified mononeuropathy of upper limb | not billable |
Mononeuritis lateral
Mononeuritis lower limb
| specified nerve NEC | G57.8 | Other specified mononeuropathies of lower limb | not billable |
Mononeuritis upper limb
| specified nerve NEC | G56.8 | Other specified mononeuropathies of upper limb | not billable |
Index terms and codes are reproduced from the official ICD-10-CM FY2027 release. The Alphabetic Index is a finding aid — a code must always be verified in the Tabular List before it is reported. Data sources